"You don't even have to calculate since area doubles every 3 steps. 4 wires = 4 x area = 6 steps. 24-6=18"
An easier way for me to remember is that the change is the same as with dB. Double the number of (same-gage) conductors (power) and the gage number (or deciBels) changes by 3. So 2 24s = 21g., and 2 21s (AKA 2 24s) = 18g.
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An easier way for me to remember is that the change is the same as with dB. Double the number of (same-gage) conductors (power) and the gage number (or deciBels) changes by 3. So 2 24s = 21g., and 2 21s (AKA 2 24s) = 18g.
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